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Strain‐dependent serotonin neuron feedback control: role of serotonin 2C receptors
Author(s) -
Calcagno Eleonora,
Invernizzi Roberto W.
Publication year - 2010
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2010.06880.x
Subject(s) - serotonin , citalopram , 5 ht receptor , agonist , 5 ht2 receptor , extracellular , medicine , endocrinology , microdialysis , chemistry , receptor , endogenous agonist , serotonin uptake inhibitors , neurotransmitter , receptor antagonist , pharmacology , serotonin reuptake inhibitor , biology , antagonist , fluoxetine , biochemistry , dopamine receptor d1
J. Neurochem. (2010) 114 , 1701–1710. Abstract We investigated the role of serotonin 2C receptor‐mediated feedback mechanisms in the response to citalopram in C57BL/6 and DBA/2 mice, which are respectively responders and non‐responders to selective serotonin reuptake inhibitors in the forced swimming test. The microdialysis technique was used to assess changes in extracellular serotonin and GABA in the mouse dorsal raphé (DR). Citalopram (1.25–20 mg/kg) raised extracellular serotonin and GABA in the DR of both mouse strains. These effects were abolished by depleting brain serotonin with p‐chlorophenylalanine (300 mg/kg × 3). Systemic and/or intra‐DR infusion of the serotonin 2C receptor antagonist 6‐chloro‐5‐methyl‐1‐[[2‐[(2‐methyl‐3‐pyridyl)oxy]‐5‐pyridyl]carbamoyl]‐indoline (1 mg/kg and 0.1 μM, respectively) enhanced citalopram’s effect on extracellular serotonin in the DR and medial prefrontal cortex and abolished the rise of GABA in the DR of DBA/2 mice but had no effect in C57BL/6 mice. The serotonin 2C receptor agonist Ro60‐0175 (0.03–3.0 mg/kg) reduced extracellular serotonin and raised GABA in the DR of DBA/2 mice but had much less effect in C57BL/6 mice. These findings show that the sensitivity of serotonin 2C receptors determines the efficacy of augmentation strategies aimed at enhancing the effect of serotonin reuptake inhibitors on extracellular serotonin through the suppression of serotonin 2C receptor‐mediated feedback control of serotonin neurons.